Device for sleeve-label labeling machines

ABSTRACT

Device for sleeve-label labeling machines, with proposal that means are provided that render the label tube ( 5 ) taut and/or spread the label tube ( 5 ) during the cutting step.

[0001] The invention relates to a device for an expanding apparatus for label tubes, particularly in sleeve-label labeling machines.

[0002] Many solutions pertaining to the affixing of labels to containers, such as, for example, bottles or cans, have become known in the art.

[0003] Aside from labeling machines that process sheet-type paper labels, also so-called roll-feed machines have become part of the state of the art. For reasons of economics, these machines do not process sheet-type labels, but use is made of thinner plastic labels which are wound in large number as continuous strip onto a roller. For labeling, individual labels are cut from this roller and are subsequently wound about the container and are there secured, for example, by gluing.

[0004] A further group of labeling machines are the so-called sleeve machines.

[0005] In this type of machine, plastic labels are also used which are wound in large number as continuous strip onto a roller. However, the plastic strip is configured as a tube, such that the labels, upon being cut, comprise a tube section which is placed in its entirety about the container. The adhesion of this tube section to a container can essentially be accomplished in two ways. Firstly, the option is provided to shrink the tube section upon placing it about the container by supply of energy, for example, by provision of heated air, so as to secure the tube section to the container. Also, there is the option to utilize a label tube section that has such an inner diameter that it needs to be somewhat expanded, in the elastic range, in order to be placed about a container.

[0006] Upon placing of the tube section about a container having been effectuated, the expansion is relaxed and the tube section adheres to the container.

[0007] Such labeling machines are used, inter alia, in the beverage industry, for the packaging of foodstuffs, or for packaging of pharmaceutical products.

[0008] Since sleeve-label labeling machines are known for quite some time, an exhaustive description of such labeling machines need not be made herein. Accordingly, the following describes in detail only the components and processing steps that are relevant to the present invention.

[0009] An essential component of sleeve-label labeling machines is the so-called arbor or mandrel.

[0010] The mandrel serves to bring about the round shape of the label tube, the original shape being flat, and to guide the label tube through the labeling machine. For this, the mandrel is introduced into the label tube and is subsequently secured in the labeling machine.

[0011] The mandrel is essentially round and its upper end is configured with a more or less prominent tip. In the installed condition, the mandrel extends essentially vertically from above to below. When considered in the longitudinal direction of the mandrel, rollers are provided at one mounting position, or several mounting positions, at the circumference of the mandrel. Such rollers respectively comprise two roller, to configure a pair of rollers, with the axes of the rollers being disposed transversely with respect to the longitudinal direction of the mandrel. Two, three, or four roller pairs are evenly distributed at the circumference of the mandrel depending on the assembly position.

[0012] For arresting the mandrel and for driving or, respectively, advancing of the label tube, the labeling machine comprises rollers that can be driven for rotation and that can be brought into working contact with the above described roller pairs of the mandrel, such that the mandrel is positively held within the labeling machine.

[0013] Although the mandrel is positively retained, due to the interaction between the rollers of the labeling machine and the pairs of rollers of the mandrel, it is possible to move the label tube in the direction along and downwardly with respect to the mandrel due to the rotation of the rollers of the labeling machine. During such movement, the label tube is located between the rollers of the labeling machine and the roller pairs of the mandrel and slides, by being driven by the rollers of the labeling machine, along the fixedly disposed mandrel in downwardly direction.

[0014] Within the region of the lower third of the length of the mandrel a groove is disposed about the entire circumference. This groove configures the clear cutting space for a cutting apparatus that is disposed exteriorly with respect to the label tube. In the case of known arrangements, such cutting apparatus comprise, for example, a swingable knife that is secured to a holder that can be driven with variable numbers of rotation. The knife describes a circular path that is concentric with reference to the longitudinal axis of the mandrel and the knife swings, at an elevated number of rotations of the holder, due to centrifugal force, into an inner position which effectuates severing of a label tube section from the supply.

[0015] The severed label tube section is transported by way of further combinations of rollers that can be driven for rotation and roller pairs in the direction along and downwardly with respect to the mandrel.

[0016] At the lower end of the mandrel, the label tube is generally gripped by a gripper device and is placed about the container. The process can subsequently be repeated anew.

[0017] So as to further increase the operating rate of such labeling machines, it is desirable to further increase the cutting speed that effectuates severing of the label tube and to raise the quality of the cut that is being effectuated.

[0018] In known configurations of sleeve-label labeling machines the intended increase of the cutting speed is only possible within narrow limits, because upon increase of cutting velocities, the label tube tends to negatively accumulate, bunch up, ahead of the knife and thus the label tube causes a cut that is not accurate and causes edges that are not precise at the label tube.

[0019] Solutions of such problems have hitherto not become known in the state of the art.

[0020] The purpose of the object of present invention proceeds from the problems described in the foregoing, namely, to provide respective remedies and improvements, such that during severing of the label tube the attendant processing is carried out with constant quality of the cut and elevated cutting speeds, which together afford shorter cycle times.

[0021] For this, the invention teaches that means are provided that expand or, respectively, hold the label tube taut during the severing process, such that the label tube is not detrimentally accumulated ahead of the knife and cutting can be accomplished with high speed and constant quality.

[0022] The invention is further described on the basis of embodiments.

[0023] In detail,

[0024]FIG. 1 shows in a simplified cross-sectional illustration a mandrel that is equipped with the components in accordance with the invention; and FIG. 2 shows in a simplified cross-sectional illustration a mandrel with control rollers and a lever-actuated expanding apparatus.

[0025] The invention essentially teaches the performance of the object by the use of one, or several, movable pressure body 1, or movable pressure bodies 1, adapted to the inner diameter of the label tube, with such bodies being disposed or, respectively, journalled within the mandrel 2.

[0026] These pressure bodies 1 can be any structures that are configured in any desired configuration; however, they have to be capable, with respect to their outer configuration and their attachment within the mandrel 2, to expand or, respectively render taut, the label tube 5 from the interior thereof.

[0027] For example, pressure bodies 1 have been found to be particularly advantageous that have the configuration corresponding to the configuration of a segment of a circle.

[0028] The pressure bodies 1 have a groove 3 at their outer surface, which groove 3 configures the clear cutting space for the knife of the cutting apparatus 4.

[0029] The respective securement means for these pressure bodies 1 are configured in such a way that they permit movement of the pressure bodies 1 in outwardly direction and in the direction towards the label tube 5, whereupon this label tube 5 is expanded and held taut, this achieving a clean cut at an elevated cutting velocity.

[0030] Particular demands are made for the configuration of the design of actuating means for the pressure bodies 1, because the circumferential surfaces 11 and the tip 12 of the mandrel 2 are constantly and fully covered by the label tube 5 during the entire course of the labeling process, and because the label tube 5 must not be damaged.

[0031] The actuating means for the pressure bodies 1 may be configured in numerous configurations, that are presented only as embodiment examples in some detail.

[0032] It is within the scope of the invention, firstly, that the pressure bodies 1 are actuated from the exterior of the label tube 5 by mechanical means. For example, for actuation, control rollers 6 can be provided at the labeling machine, which control rollers 6 are moved radially towards the mandrel 2 during operation of the expanding apparatus. Within the mandrel 2, means are provided that translate the delivery movement that is effectuated by the control rollers 6 into the expanding movement of the pressure bodies 1. These translating means can be, for example, levers 7 and a counter roller 6′. In a further sensible embodiment of the invention, the delivery movement of the control rollers 6 can be conveyed to the pressure bodies 1 by pneumatic components or hydraulic components.

[0033] Furthermore, it is within the scope of the invention to actuate the pressure bodies 1 from the exterior of the label tube 5 by electromagnetic means. For such actuation at least one electromagnet is disposed at the labeling machine in such a way that in its activated state it can interact with the mandrel 2. In this actuating method, the pressure bodies 1 within the mandrel 2 are fully, or partially, made of a magnetic material. When the at least one electromagnet is actuated by way of a machine controller, not illustrated, the pressure bodies 1 move in outwardly direction and expand the label tube 5.

[0034] Such an electromagnet can also be disposed within the cutting apparatus 4 or it can be connected in controlling and operative manner to the cutting apparatus 4 in such a way that upon the cutting apparatus being moved into the entry position, simultaneously expansion of or, respectively, activation of the pressure bodies 1 is effectuated.

[0035] In further embodiments of the invention that are particularly advantageous, means are disposed within the mandrel 2 that perform the expanding movement of the pressure bodies 1 without input of energy from the exterior of the label tube 5.

[0036] Such embodiments present the initial demand to make provision for the energy that is necessary for actuation of the pressure bodies 1 to be available within the mandrel 2. For this, it is firstly within the scope of the present invention to provide at least one accumulator 8, or several accumulators 8, for electrical energy within the mandrel 2. With such an arrangement it is of particular advantage that the at least one accumulator 8 be disposed at the lower end of the mandrel 2. This permits that the accumulator 8 can be exchanged without dismantling of the mandrel 2 or, respectively, without removal of the label tube 5 from the mandrel 2 or, respectively, the removal of the mandrel 2 from the labeling machine.

[0037] A further approach of the delivery of energy to the mandrel 2 resides therein that electrical energy is transferred into the mandrel 2 by way of induction. In this method, a transmitter 9 of induction energy is disposed at the labeling machine. The interior of the mandrel 2 houses a receiver 10 for induction energy and the receiver 10 captures the electromagnetic pulses that are emitted by the transmitter 9 of induction energy, and converts the sent electromagnetic impulses again into electrical energy.

[0038] Also, when employing energy transmission into the mandrel 2 by way of induction, additional accumulators 8 can be provided within the mandrel 2.

[0039] Upon electrical energy being available within the mandrel 2, the actuation of the pressure bodies 1 may be performed in a number of ways. For example, electromagnets 11, or electric motors, and/or electrical control devices can be provided that are configured to move the pressure bodies 1.

[0040] As well, embodiments can be provided which permit the movement of the pressure bodies 1 by way of electrostatic charge. When use is made of this approach, it is of particular advantage in order to attain sufficiently large electrostatic forces, to configure the pressure bodies 1 with particularly large surfaces and to position them adjacent a surface that has an equally large surface. Both surfaces can be supplied with an identical tension that is rather high.

[0041] When actuating the pressure bodies 1 from the interior, it is of particular advantage to transmit the control commands that are required for control of the pressure bodies 1 from a location that is exteriorly with respect to the mandrel 2. For this, use can be made of all methods of the prior art, such as, for example, radio signals, magnetic switches, capacitive switches, or mechanical switches.

[0042] For controlling and monitoring of the movements of the pressure bodies 1, a microcomputer can be disposed within the mandrel 2. Particularly applicable are so-called single-board computers that can perform, with small size, switching functions, metrological functions, and control functions.

[0043] As well, within the mandrel 2, sensors may be disposed that monitor, and/or control, either with or without operative connection to the microcomputer, for example, in respect of the supply of tension and the transport velocity of the label tube 5.

[0044] The required reset movement of the pressure bodies 1, upon severing of the label tube 5 can be provided by suitable means in all described embodiments. Such means can be, for example, springs, magnets, or the like.

[0045] The illustration and description of further electrical elements disposed within the mandrel 2, such as, connecting conduits, relays, fuses, etc., is considered not being necessary inasmuch as these are described to a sufficient extent in the prior art. 

1. Device for sleeve-label labeling machines, characterized thereby that means are provided that render the label tube (5) taut and/or spread the label tube (5) during the cutting step.
 2. Device according to claim 1, characterized thereby that the means comprise pressure bodies (1) that are substantially configured as shapes of a segment of a circle.
 3. Device according to one or both of claims 1 and 2, characterized thereby that actuation of the pressure bodies (1) is carried out by control rollers (6) that are secured at the labeling machine.
 4. Device according to one of claims 1 to 3, characterized thereby that transfer of force within the mandrel (2) from the control rollers (6) to the pressure bodies (1) is done by levers (7).
 5. Device according to one of claims 1 to 4, characterized thereby that transfer of force within the mandrel (2) from the control rollers (6) to the pressure bodies (1) is done by pneumatic components.
 6. Device according to one of claims 1 to 5, characterized thereby that transfer of force within the mandrel (2) from the control rollers (6) to the pressure bodies (1) is done by hydraulic components.
 7. Device according to one of claims 1 to 6, characterized thereby that the pressure bodies (2 sic) comprise in full or in part a magnetic material, and that they are actuated by at least one electromagnet that is disposed exteriorly with respect to the label tube (5) and that is secured to the labeling machine.
 8. Device according to one of claims 1 to 7, characterized thereby that an accumulator (8) is disposed within the mandrel (2).
 9. Device according to one of claims 1 to 8, characterized thereby that electrical energy is transferred by way of induction into the mandrel.
 10. Device according to one of claims 1 to 9, characterized thereby that actuation of the pressure bodies (1) is done by electromagnets (11) that are disposed within the mandrel (2).
 11. Device according to one of claims 1 to 10, characterized thereby that actuation of the pressure bodies (1) is done by electric motors that are disposed within the mandrel (2).
 12. Device according to one of claims 1 to 11, characterized thereby that actuation of the pressure bodies (1) is done by electrostatic charge.
 13. Device according to one of claims 1 to 12, characterized thereby that a microcomputer is disposed within the mandrel (2).
 14. Device according to one of claims 1 to 13, characterized thereby that sensors are disposed within the mandrel (2).
 15. Device according to one of claims 1 to 14, characterized thereby that actuation of the pressure bodies (1) is done by electric control drives. 